wtf is diplomat?

Diplomat is a tool that helps developers who write code in Rust, a fast, memory-safe programming language, share that code with projects written in other languages. Normally, getting code from one language to talk to another is tedious and error-prone. This project automates that process. You mark which parts of your Rust code should be shared, and it generates the necessary glue code so that C, C++, and JavaScript projects can use it directly. The tool works through a plugin system. It has built-in support for generating bindings for C, C++, and JavaScript, and the plugin architecture means developers can add support for other languages too. From the user's perspective, you add a couple of dependencies to your Rust project, use a special annotation (called a macro) to flag the APIs you want to expose, and run the command-line tool to produce the binding files for your target language. This would appeal to teams building core libraries in Rust who want to reuse that code across different platforms and tech stacks. For example, if a startup builds a data-processing engine in Rust but ships a web app in JavaScript, this tool bridges that gap without a manual rewrite. A company maintaining a C++ desktop application could also benefit from adopting Rust for new modules without abandoning their existing codebase. The project is explicitly experimental, so it's worth treating as something to explore rather than deploy in production tomorrow. The README points to a separate book and design doc for deeper guidance, but doesn't go into detail on specific limitations or maturity of each language plugin. One notable design choice is the snapshot testing approach, when the code generation logic changes, developers can review the output differences side by side before accepting them, which helps catch unintended changes in what gets generated.